Hydration, food, and sleep are the main compents of a good run. In the morning it may help to have something small to eat to kick start your energy levels. Psyching yourself out doesn't help, maybe pump yourself up with some music before you head out.

I used to have a fear of getting hiccups from swallowing air when I was younger. It got to a point where I would have to control how much air was still in my mouth, and to get as much out as possible. It was weird. I fixed that by kinda just relaxing and reassuring myself that nothing bad will happen. I'm trying to do that now with this problem - it's helping.

If it is an OCD thing, maybe you could try relaxation techniques or keeping a diary and writing down your feelings when it's happening so it isn't bottled up as much and make you feel a little less anxious/stressed.

I think I like the fact that the 110 has a much longer battery life and that all the information is on the one screen, compared to the 10 which you have to flip through the screens. I'll have to have a think.

It's normal to be nervous, but you may just be letting your worries get the best of you. I would just sign up for something small and have fun, not worry about anything and just try to finish it. You'll find that most people will be nervous if it's their first race too.